Power supply



FIG. 1 is a bottom, front, right perspective view of a power supply, showing our design.

FIG. 2 is a front elevation view thereof.

FIG. 3 is a rear elevation view thereof.

FIG. 4 is a left side elevation view thereof.

FIG. 5 is a right side elevation view thereof.

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in the drawings are for the purpose of illustrating portions of the power supply that form no part of the claimed design. 

CLAIM The ornamental design for a power supply, as shown and described. 